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Secondary battery of excellent sealability

a technology of sealability and secondary batteries, applied in the direction of cell components, flat cell grouping, sustainable manufacturing/processing, etc., can solve the problems of accelerating the reduction of reducing the service life of the battery, etc., to reduce the movement of increase the surface area, and reduce the effect of the movement of the moisture or the electroly

Active Publication Date: 2006-09-28
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] As a result of a variety of extensive and intensive studies and experiments to solve the problems as described above, the inventors of the present application have discovered that, when minute irregular parts are formed on predetermined areas of the surfaces of the electrode leads, to which the resin films are applied, the adhesive strength between the resin films and the electrode leads is highly increased under the welding conditions of the battery case (temperature and pressure), and therefore, introduction of moisture contained in the air into the secondary battery and leakage of an electrolyte from the secondary battery are effectively prevented. The present invention has been completed based on the above-mentioned discovery.
[0024] The shape and the orientation of the irregular parts according to the present invention are not particularly restricted. Preferably, each of the irregular parts includes a plurality of grooves formed at an angle of 0° (horizontal) to 50° to the upper end surface of the battery case. The grooves increase the contact areas between the electrode leads and the resin films, and extend the movement path of moisture and electrolyte.

Problems solved by technology

As a result, the service life of the battery is reduced with the passage of time.
When the upper end member 210 and the lower end member 220 of the battery case 200 are welded to each other at higher temperature and higher pressure in order to solve the above-mentioned problems, the resin films may be melted, and therefore, the outer surface of the battery is contaminated, or the thin resin films are damaged, which accelerates the reduction of the service life of the battery.
However, this chromate treatment causes environmental pollution due to heavy metals, and therefore, it is not desirable.

Method used

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  • Secondary battery of excellent sealability
  • Secondary battery of excellent sealability
  • Secondary battery of excellent sealability

Examples

Experimental program
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Effect test

example 1

[0047] The surfaces of aluminum foil (foil for the cathode) and copper foil (foil for the anode), each of which has a size of 45 mm×30 mm and a thickness of approximately 350 μm, were rubbed by means of an SiC paper having a roughness of #800 grit at a rotating speed of 1000 to 1200 rpm for 3 minutes (SiC paper grinding). As a result of observation of the surfaces of the aluminum foil and the copper foil using a transmission electron microscope, it was confirmed that grooves having an average size of 4 to 5 μm were formed on the surfaces of the aluminum foil and the copper foil. The aluminum foil and the copper foil, the surfaces of which were treated as described above, were attached to the electrode taps of the electrode assembly by welding, and then resin films, which are made of polypropylene, were attached to the upper end surfaces and the lower end surfaces of the aluminum foil and the copper foil. Subsequently, the electrode assembly was mounted in the pouch-shaped battery ca...

example 2

[0048] A lithium-ion polymer battery was manufactured in the same manner as Example 1, except that the surfaces of the aluminum foil and the copper foil were treated by sand blasting instead of the above-mentioned SiC paper grinding. It was confirmed that grooves having an average size of 5 to 6 μm were formed on the surfaces of the aluminum foil and the copper foil by the sand blasting.

example 3

[0049] A lithium-ion polymer battery was manufactured in the same manner as Example 1, except that the surfaces of the aluminum foil and the copper foil were treated by sand blasting, followed by phosphate treatment. It was confirmed that grooves having an average size of 5 to 6 μm were formed on the surfaces of the aluminum foil and the copper foil by the above-mentioned surface treatment.

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Abstract

Disclosed herein is a secondary battery comprising electrode leads mounted in a sealed fashion in a battery case while the electrode leads partially protrude from the battery case and resin films disposed between the battery case and the electrode leads wherein the electrode leads are provided at predetermined areas of the surfaces thereof, to which the resin films are applied, with irregular parts, by which the adhesive strength between the electrode leads and the resin films is increased. The adhesive strength between the electrode leads and the resin films is large, and the movement path of moisture or electrolyte, through which the moisture contained in the air or the electrolyte contained in the secondary battery may move, is extended. Consequently, the present invention has the effect of minimizing the reduction in service life of the secondary battery due to introduction of the moisture into the secondary battery and leakage of the electrolyte from the secondary battery. The secondary battery is very useful as a unit cell for medium- or large-sized battery systems, such as hybrid electric vehicles.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a secondary battery with excellent sealability, more particularly, to a high-output, large-capacity secondary battery having minute irregular parts formed at predetermined areas of the surfaces of electrode leads, to which resin films are applied, such that the adhesive strength between the electrode leads and the resin films, which are disposed between the electrode leads and a battery case, is improved, whereby introduction of moisture contained in the air into the secondary battery and leakage of an electrolyte from the secondary battery are effectively prevented, and therefore, the service life of the secondary battery is increased. BACKGROUND OF THE INVENTION [0002] Recently, a secondary battery, which can be charged and discharged, has been widely used as an energy source for wireless mobile devices. Also, the secondary battery has attracted considerable attention as a power source for electric vehicles and hybrid ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01M2/06H01M2/08H01M10/05H01M50/119H01M50/178H01M50/533H01M50/534H01M50/55H01M50/557H01M50/562
CPCH01M2/021H01M2/0212H01M2/0262H01M2/06Y02T10/7011H01M2/305H01M10/0413H01M10/0525H01M2/08Y02T10/70H01M50/557H01M50/178H01M50/55H01M50/533H01M50/119H01M50/534H01M50/562Y02E60/10H01M50/20Y02P70/50
Inventor YOU, SEUNGJAEYU, JISANG
Owner LG ENERGY SOLUTION LTD
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